Study of electronic state of supported gold nanospecies by IR spectroscopy

Author

Martynyuk, O. ; Pestryakov, A. ; Bogdanchikova, N. ; Tiznado, H. ; Zepeda, T.A. ; Tuzovskaya, I.

Author_Institution

Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Apdo. Postal 14, C. P. 22800, Ensenada, México

fYear

2012

fDate

18-21 Sept. 2012

Firstpage

1

Lastpage

4

Abstract

The nature of different Au species supported on hexagonal mesoporous silica has been studied by infrared spectroscopy of adsorbed CO. Experiments revealed existence of the following states of supported gold: neutral metal particles Au°, ions Au⁺ and a number of partly charged states Au^δ+ with different effective charge. Redox pretreatments (vacuum, O₂ and H₂) of Au/SiO₂ at the different temperatures (100, 300 and 500°C) exert a significant effect on the electronic state of supported Au species. The experiments showed high stability of Au^δ+ states under all treatments; that may prove their active role in catalytic properties of gold.

Keywords

adsorption; carbon compounds; catalysis; gold; infrared spectra; mesoporous materials; nanofabrication; nanoparticles; nanoporous materials; oxidation; porosity; reduction (chemical); silicon compounds; surface states; Au-SiO₂; CO; adsorbed carbon oxide; catalytic properties; effective charge; electronic state; hexagonal mesoporous silica; infrared spectroscopy; neutral metal particles; partly charged states; redox pretreatments; supported gold nanospecies; temperature 100 degC; temperature 300 degC; temperature 500 degC; Gold; Ions; Mesoporous materials; Oxidation; Silicon compounds; Spectroscopy; CO adsorbtion; gold catalyst; mesoporous silica; redox pretreatments;

fLanguage

English

Publisher

ieee

Conference_Titel

Strategic Technology (IFOST), 2012 7th International Forum on

Conference_Location

Tomsk

Print_ISBN

978-1-4673-1772-6

Type

conf

DOI

10.1109/IFOST.2012.6357581

Filename

6357581